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file upload

I've seen a few tutorials on file uploading, by using $_HTTP_ variables and $_FILES, however to use $_FILES on the back side to grab the uploaded file the second version here requires to register Global Variables. I have heard however that it is best not to register global variables. I have not found any tutorials on why this is the case or how to accept file uploads w/o registering global variables.

I need some advice here. Do I just break down and register globals or is there another way?

I'm using php 4.3.3

I've also tried to grab the file by $_HTTP_ variable but, have not seen anything.